Article(id=1228654093674148516, tenantId=1146029695717560320, journalId=1225147924628267009, issueId=1228654089437901468, articleNumber=null, orderNo=null, doi=10.16385/j.cnki.issn.1004-4523.2024.12.013, pmid=null, cstr=null, oa=null, hot=null, price=null, onlineType=0, articleFormat=0, articleType=null, articleTypeStr=null, receivedDate=1668873600000, receivedDateStr=2022-11-20, revisedDate=1677686400000, revisedDateStr=2023-03-02, acceptedDate=null, acceptedDateStr=null, onlineDate=1770863563220, onlineDateStr=2026-02-12, pubDate=1735315200000, pubDateStr=2024-12-28, doiRegisterDate=null, doiRegisterDateStr=null, onlineIssueDate=1770863563220, onlineIssueDateStr=2026-02-12, onlineJustAcceptDate=null, onlineJustAcceptDateStr=null, onlineFirstDate=null, onlineFirstDateStr=null, sourceXml=null, magXml=null, createTime=1770863563220, creator=13701087609, updateTime=1770863563220, updator=13701087609, issue=Issue{id=1228654089437901468, tenantId=1146029695717560320, journalId=1225147924628267009, year='2024', volume='37', issue='12', pageStart='1993', pageEnd='2167', issueExtLink='null', onlineDate='null', pubDate='null', beforeIssueId=null, nextIssueId=null, price=null, status=1, issueComplete=1, articleOrder=1, issueType=-1, specialIssue=null, createTime=1770863562211, creator=13701087609, updateTime=1770863940325, updator=13701087609, preIssue=null, nextIssue=null, ext={EN=IssueExt(id=1228655675413299456, tenantId=1146029695717560320, journalId=1225147924628267009, issueId=1228654089437901468, language=EN, specialIssueTitle=, coverIllustrator=null, specialIssueEditor=, specialIssueAbout=), CN=IssueExt(id=1228655675413299457, tenantId=1146029695717560320, journalId=1225147924628267009, issueId=1228654089437901468, language=CN, specialIssueTitle=, coverIllustrator=null, specialIssueEditor=, specialIssueAbout=)}, issueFiles=null}, startPage=2114, endPage=2123, ext={EN=ArticleExt(id=1228654093904835241, articleId=1228654093674148516, tenantId=1146029695717560320, journalId=1225147924628267009, language=EN, title=Model free adaptive control of rotor system with dry friction damper, columnId=null, journalTitle=Journal of Vibration Engineering, columnName=null, runingTitle=null, highlight=null, articleAbstract=

In order to apply active dry friction dampers (DFD) to the vibration control of rotor system,a model free adaptive force control scheme is proposed,where virtual feedback tuning method is exploited to tune the initial parameters. Vibration characteristics of the active DFD-rotor system are analyzed based on a two-dimensional dry friction dynamic model. And vibration control strategies are proposed to match the response characteristics of rotors. Then,a compact-form dynamic linearization model is applied to design model free adaptive control algorithm. Meanwhile,considering the cumbersome work of initial parameter tuning,a virtual reference feedback tuning procedure is used to initialize parameters for the controller and the rules to choose parameters used for off-line data generation is also discussed herein. In order to verify the efficacy of the proposed algorithm,a rotor system containing two discs is taken as the numerical example. Results reveal that,based on one single off-line parameter tuning procedure,the rotor vibration when critical speed is traversed can be efficiently controlled by the proposed control strategy. Meanwhile,for steady vibration control,the proposed strategy is able to adaptively apply controllable forces only if the vibration level is too large,in which case the unbalanced responses of rotors can be sustained within allowable range.

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针对采用主动式干摩擦阻尼器对转子系统的振动进行主动控制的问题,提出了一种应用虚拟参考反馈整定技术优化初参数的无模型自适应控制策略。利用二维干摩擦动力学模型分析了主动式干摩擦阻尼器转子系统的不平衡响应,设计了与系统响应特性相匹配的振动主动控制策略;采用紧格式的动态线性化模型设计了无模型自适应控制方法;针对算法初参数选取困难的问题,提出了基于虚拟参考反馈整定的控制器初参数选取方法,讨论了离线数据生成参数的选取规则。为验证所提控制策略的有效性,以一主动式干摩擦阻尼器双盘柔性转子系统为例进行了数值仿真。结果表明:所提控制策略仅通过对干摩擦阻尼器进行一次参数离线整定就能够有效地控制转子系统在过临界转速区的振动;在稳态转速下,控制策略可以仅在振动过大时才产生作用,使转子系统的振动保持在安全范围内。

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祝长生(1963―),男,博士,教授。E-mail:
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蒋明宏(1997—),男,博士研究生。E-mail:

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蒋明宏(1997—),男,博士研究生。E-mail:

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ArticleFig(id=1228654130563052474, tenantId=1146029695717560320, journalId=1225147924628267009, articleId=1228654093674148516, language=CN, label=图14, caption=不同预设振幅对应的盘1响应及正压力变化, figureFileSmall=xHxRaDlJdryfdNTynV1IeA==, figureFileBig=27xbb/TsBn/ERw6IcLlW/Q==, tableContent=null), ArticleFig(id=1228654130625967036, tenantId=1146029695717560320, journalId=1225147924628267009, articleId=1228654093674148516, language=EN, label=Tab.1, caption=

Structural parameters of the rotor system

, figureFileSmall=null, figureFileBig=null, tableContent=
参数数值单位
各轴段长度(1~7)0.11/0.13/0.06/0.2/0.1/0.16/0.09m
各轴段单元数(1~7)3/4/3/5/2/4/3
各轴段直径(1~7)0.02/0.02/0.02/0.03/0.02/0.02/0.02m
各盘直径(1~2)0.2/0.1m
各盘厚度(1~2)0.01/0.01m
弹支刚度5×105N/m
弹支阻尼40N·s/m
阻尼器切向刚度108N/m
动摩擦系数0.3
), ArticleFig(id=1228654130705658815, tenantId=1146029695717560320, journalId=1225147924628267009, articleId=1228654093674148516, language=CN, label=表1, caption=

转子系统结构参数

, figureFileSmall=null, figureFileBig=null, tableContent=
参数数值单位
各轴段长度(1~7)0.11/0.13/0.06/0.2/0.1/0.16/0.09m
各轴段单元数(1~7)3/4/3/5/2/4/3
各轴段直径(1~7)0.02/0.02/0.02/0.03/0.02/0.02/0.02m
各盘直径(1~2)0.2/0.1m
各盘厚度(1~2)0.01/0.01m
弹支刚度5×105N/m
弹支阻尼40N·s/m
阻尼器切向刚度108N/m
动摩擦系数0.3
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干摩擦阻尼器转子系统无模型自适应振动控制
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蒋明宏 , 祝长生
振动工程学报 | 2024,37(12): 2114-2123
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振动工程学报 | 2024, 37(12): 2114-2123
干摩擦阻尼器转子系统无模型自适应振动控制
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蒋明宏 , 祝长生
作者信息
  • 浙江大学电气工程学院,浙江 杭州 310027
  • 蒋明宏(1997—),男,博士研究生。E-mail:

通讯作者:

祝长生(1963―),男,博士,教授。E-mail:
Model free adaptive control of rotor system with dry friction damper
Ming-hong JIANG , Chang-sheng ZHU
Affiliations
  • College of Electrical Engineering,Zhejiang University,Hangzhou 310027,China
出版时间: 2024-12-28 doi: 10.16385/j.cnki.issn.1004-4523.2024.12.013
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针对采用主动式干摩擦阻尼器对转子系统的振动进行主动控制的问题,提出了一种应用虚拟参考反馈整定技术优化初参数的无模型自适应控制策略。利用二维干摩擦动力学模型分析了主动式干摩擦阻尼器转子系统的不平衡响应,设计了与系统响应特性相匹配的振动主动控制策略;采用紧格式的动态线性化模型设计了无模型自适应控制方法;针对算法初参数选取困难的问题,提出了基于虚拟参考反馈整定的控制器初参数选取方法,讨论了离线数据生成参数的选取规则。为验证所提控制策略的有效性,以一主动式干摩擦阻尼器双盘柔性转子系统为例进行了数值仿真。结果表明:所提控制策略仅通过对干摩擦阻尼器进行一次参数离线整定就能够有效地控制转子系统在过临界转速区的振动;在稳态转速下,控制策略可以仅在振动过大时才产生作用,使转子系统的振动保持在安全范围内。

振动控制  /  无模型自适应控制  /  转子系统  /  干摩擦阻尼器  /  虚拟参考反馈整定

In order to apply active dry friction dampers (DFD) to the vibration control of rotor system,a model free adaptive force control scheme is proposed,where virtual feedback tuning method is exploited to tune the initial parameters. Vibration characteristics of the active DFD-rotor system are analyzed based on a two-dimensional dry friction dynamic model. And vibration control strategies are proposed to match the response characteristics of rotors. Then,a compact-form dynamic linearization model is applied to design model free adaptive control algorithm. Meanwhile,considering the cumbersome work of initial parameter tuning,a virtual reference feedback tuning procedure is used to initialize parameters for the controller and the rules to choose parameters used for off-line data generation is also discussed herein. In order to verify the efficacy of the proposed algorithm,a rotor system containing two discs is taken as the numerical example. Results reveal that,based on one single off-line parameter tuning procedure,the rotor vibration when critical speed is traversed can be efficiently controlled by the proposed control strategy. Meanwhile,for steady vibration control,the proposed strategy is able to adaptively apply controllable forces only if the vibration level is too large,in which case the unbalanced responses of rotors can be sustained within allowable range.

vibration control  /  model free adaptive control  /  rotor system  /  dry friction damper  /  virtual reference feedback tuning
蒋明宏, 祝长生. 干摩擦阻尼器转子系统无模型自适应振动控制. 振动工程学报, 2024 , 37 (12) : 2114 -2123 . DOI: 10.16385/j.cnki.issn.1004-4523.2024.12.013
Ming-hong JIANG, Chang-sheng ZHU. Model free adaptive control of rotor system with dry friction damper[J]. Journal of Vibration Engineering, 2024 , 37 (12) : 2114 -2123 . DOI: 10.16385/j.cnki.issn.1004-4523.2024.12.013
转子系统是各类旋转机械的关键组成部分,其振动水平决定了旋转机械能否安全稳定运行。尤其是当转子系统因叶片丢失、表面结垢、机械结构变形等因素出现不平衡变化,或是在转子过临界转速区时,如何对转子系统的振动进行有效控制就成为了旋转机械转子系统设计的一个主要问题。
近几年,用主动式干摩擦阻尼器(dry friction dampers,DFD)控制转子系统的振动得到了越来越多的关注。相比于被动式DFD,主动式DFD能够根据转子运行工况的变化自动地改变阻尼器的性能参数以实现对转子振动的主动控制;同时,主动式DFD的耗散特性一定程度上也保证了被控对象的自稳定性1,不会引起被控系统的失稳,具有广阔的应用前景。王四季等2设计了一种电磁式主动弹支DFD,并进行了转子系统在升/降速过程中振动控制的相关试验,指出通过在DFD摩擦副上施加大小合适的正压力,转子系统在经过临界转速区时的振动能够被有效抑制3。此外,文献[2]还验证了应用主动式DFD在突变不平衡载荷情形下进行转子振动控制的可行性。为减小阻尼器的体积,宋明波等4、LIAO等5进一步设计了以压电陶瓷作为执行机构的主动式DFD,但这些研究主要关注在DFD摩擦副界面上施加恒定的正压力。已有研究表明,采用变正压力的主动式DFD可以使转子系统的振动得到更有效的控制。如WU等6在最佳正压力的基础上通过施加特定阶数的谐波分量以增强DFD的减振能力。LIU等7通过在跨临界转速区施加随模态振幅变化的最佳正压力,有效地降低了转子系统在过临界连接转速区的振动。然而,上述研究均未给出这些正压力控制策略的闭环实施方案,因而尚有一定的局限性。
DFD产生的摩擦力受摩擦副接触面的运动状态、正压力、摩擦副材料等因素影响,且存在有预位移、黏滑转换、非局部记忆等现象8,这导致难以基于模型来设计DFD的控制算法,因而采用基于系统I/O信号的数据驱动方法9来设计DFD摩擦副上正压力的控制策略就成为了一种可行的控制方案。王四季等10先用比例控制实现了弹支局部断裂情况下转子系统的振动抑制;然后又提出了一种连续增益调度的PI控制方法11,其中描述增益调度关系的形状参数需要人为取定。他们还对比了开⁃关控制与比例控制下转子系统跨临界转速区的不平衡响应,指出通过合理选择比例系数就能够获得与施加最佳正压力相近的控制效果,但同样未给出参数的具体整定方法12
无模型自适应控制13(model free adaptive control,MFAC)是一种数据驱动的控制方法,该方法基于实时I/O数据建立系统当前状态的动态线性化模型,具有无需系统模型、参数可实时更新等优点,目前有许多学者对MFAC在实际工程应用中的相关问题开展了研究。邓望权等14提出了一种PI控制与MFAC相结合的燃气轮机转速控制方法,并采用遗传算法来获得最优的MFAC控制器参数。宋泽雨等15用遗传算法将MFAC参数整定简化为步长参数寻优,以一炼油单元为研究对象说明了整定后MFAC的有效性。这些控制器的在线参数整定方法需要长时间的优化搜索才能获得最佳的初参数,而以虚拟参考反馈整定技术(virtual reference feedback tuning,VRFT)为代表的离线参数整定方法则能够一次完成控制器参数寻优,具有更高的效率。CAMPI等16将VRFT应用到MFAC的参数自整定中,说明了如何选取滤波函数来使得简化后的性能指标与原指标的极值点一致。金尚泰等17研究了用VRFT对紧格式MFAC进行控制器参数整定的方法,并给出了时变系统伪偏导初始值的更新公式。王丹娜18在此基础上用VRFT对全格式MFAC进行了控制器参数整定,通过仿真算例说明了VRFT⁃MFAC算法的有效性。尽管MFAC已经在各应用领域表现出了良好的控制性能,且引入VRFT进行参数整定后具有不需要系统模型、参数整定可离线化等优点,但目前该方法在转子系统振动控制中的应用还鲜有报道。
针对主动式DFD转子系统的振动控制问题,本文设计了基于虚拟参考反馈整定技术的DFD摩擦副上正压力的无模型自适应控制策略。首先,建立转子系统干摩擦阻尼器的二维运动的动力学模型,分析主动式DFD转子系统响应随阻尼器摩擦副上正压力的变化规律,提出与系统响应特性相匹配的振动控制策略。其次,基于紧格式无模型自适应控制理论,设计DFD的正压力控制算法;针对伪偏导初始估计值选取困难的问题,基于虚拟参考反馈整定技术设计伪偏导的初值估计方法,并结合DFD的动力学特性讨论离线I/O数据生成参数的选取规则。最后,在一主动式DFD双盘转子系统上进行数值仿真,对所提出的控制策略的有效性进行验证。
图1为主动式DFD的结构示意图19,其主要由轴承座、弹性环、固定在弹性环轴颈上的动摩擦片、固定在可轴向移动铁芯滑块上的静摩擦片、铁芯滑块、激励线圈、力传感器及限位钢珠等组成。为了减小DFD对弹性环的影响,DFD的左右结构完全对称。
在限位钢珠的约束下,铁芯以及静摩擦片的运动被限制在轴向。当向主动式DFD线圈中通入控制电流时,将在沿铁芯、气隙、定子的路径上形成磁路。在磁场的作用下,可动铁芯沿轴向挤压静摩擦片。由于环形气隙均匀,因而在动/静摩擦片接触面上产生了一个均匀的正压力19。转子振动带动动摩擦片在径向平面上运动,进而使得动/静摩擦片之间产生相对滑动,在正压力的作用下在径向平面上产生摩擦力,以消耗转子的振动能量,达到减振的目的。动/静摩擦片接触面上的正压力随线圈电流而变化。当线圈电流断开时,铁芯将在复位弹簧的作用下回到原位,动/静摩擦片分离,此时阻尼器不工作。
对于均匀正压力作用下的二维平面摩擦,图2所示的弹簧⁃库仑摩擦模型能够有效描述接触面上摩擦力与相对位移的关系2021。该模型将动/静摩擦片间环形接触面的运动用节点来表示,并将该节点通过弹簧与库仑摩擦节点连接。忽略节点的质量,k时刻的摩擦力将由节点与库仑摩擦节点的相对位置决定,即
式中  k时刻的复摩擦力;为弹簧的切向刚度;k时刻节点的复位移;k时刻节点的复位移。
由于节点是被动跟随节点运动的,k时刻无法直接得到,因而轨迹跟踪法被广泛应用于获得点的运动状态22。该方法在每一时刻通过判定界面接触状态来更新节点的位移。界面接触状态的判定条件为:
式中  为静摩擦系数;k时刻的正压力;表示对复数取模。
黏滞状态下,库仑摩擦节点将处于静止状态,因而位移保持不变:
滑动状态下,库仑摩擦节点将较上一时刻产生相对位移,对应k时刻的为:
式中  k时刻节点与上一时刻库仑摩擦节点的位移差。
主动式DFD通过改变摩擦副上的正压力控制转子振动,因此有必要获得转子响应随正压力的变化规律,从而设计合理的控制策略。为了分析不同正压力下主动式DFD转子系统的振动特性,这里选择了Jeffcott转子模型31121。取运动节点为转子中心,结合1.2节建立起主动式DFD双自由度转子系统处于恒定转速和匀加速运动时的动力学模型,然后用数值积分法求解不同正压力条件下的转子响应。
图34分别为不同正压力条件下主动式DFD转子系统在稳态和恒加速运行状态下的不平衡响应曲线。结果表明,在恒定正压力的条件下,转子系统的临界转速将随正压力的增大而逐渐增大,最小临界转速为DFD摩擦副分离(正压力为0)状态下的弹支临界转速,最大临界转速为DFD摩擦副完全黏滞(正压力无穷大)状态下的拟刚支临界转速。这是因为当正压力过大时,结合式(1)和(2)可知界面黏滞使DFD处于拟刚性状态,所以转子系统的临界转速将远大于弹支时的临界转速。另外,在弹支临界转速区,转子的不平衡振幅随DFD摩擦副上正压力的增大而减小,而在拟刚支临界转速区转子振幅逐渐增大,这与其他文献的结论一致23
很显然,并非在任何转速区利用DFD都能够对转子系统的振动进行抑制,为此将转速区分为振动能控区和振动非能控区。振动能控区在弹支临界转速区,其上、下边界由DFD摩擦副处于分离及黏滞状态下的响应曲线所确定,在此区间增大DFD摩擦副间的正压力就可以抑制转子系统的振动。非能控区在拟刚支临界转速区,转子的振动随摩擦副上正压力的增大而增大,改变正压力不会使转子的振动减小。
综上所述,由于主动式DFD本质是通过改变阻尼器的摩擦力而不是向系统中直接输入作用力来进行转子振动的控制,其减振性能将受到摩擦副接触状态的约束。因此,需要结合转子系统的响应特征来设计DFD的正压力控制策略,否则应用DFD反而可能使转子振动增强。
本节结合DFD转子系统响应特性的变化规律,提出了基于MFAC的主动式DFD正压力控制策略。对于一般的主动式DFD转子系统,基于Lagrange方程并用有限元法就能够得到系统的动力学方程:
式中  分别为转子系统的质量、阻尼、刚度及陀螺矩阵;分别为转子系统广义加速度、广义速度及广义位移;为广义不平衡力向量;为广义外部力向量。本文主要考虑DFD的干摩擦力。
以DFD摩擦副上的可控正压力作为输入u,并以目标位置处转子的振幅作为输出y,将式(5)改写为由内部状态变量、输入u及输出y所描述的单输入单输出离散形式:
式中  k+1时刻目标位置处转子的振幅;~分别为系统k时刻的第1~n个内部状态变量;k时刻DFD摩擦副上的正压力大小;为描述状态转移过程的隐式函数。
振动控制目标为将输出y维持在预设振幅以下,紧格式的MFAC通过引入伪偏导数(pseudo partial derivatives,PPD)进行正压力控制算法的设计,为了保证算法渐近稳定,系统应满足的条件为9
条件1:除了有限时刻点外,隐式函数f关于变量u的偏导数是连续的;
条件2:除了有限时刻点外,转子系统满足广义Lipschitz条件,即任意两个不同时刻,若,则有:
式中  b为正常数。
条件3:对于的任意时刻,当摩擦副上的正压力维持不变即时,目标位置处转子的振幅变化是有界的。
条件4:对于目标位置处给定的有界期望转子振幅,存在一个有界的正压力载荷,使得目标位置处转子的振幅输出等于
条件5:对于任意时刻k以及,系统PPD的符号保持不变。
上述条件1~3容易满足,条件1是针对一般状态可控的主动式DFD转子系统的典型约束条件,条件2表明有界的摩擦副上正压力的变化将在转子目标位置处产生有界的振幅改变,条件3是用被动式DFD对转子系统的振动进行控制时转子系统振幅变化的一般性描述。
对于主动式DFD转子系统,条件4与条件5需要通过合理设计主动式DFD的正压力控制策略才能满足。结合图34关于主动式DFD⁃转子系统动力学特性的讨论可知,条件4表明转子目标位置处的期望振幅应位于能控区上下边界内,条件5表明增大正压力不会导致目标位置处转子的振动增大,即工作转速应远离非能控区。
因此,本文设计了与主动式DFD转子系统响应特性相匹配的振动控制策略。对于转子过临界转速区的振动控制,应首先确定合理的工作转速区间以保证主动式DFD工作在能控区,并设置处于能控区上下边界内的振幅作为期望输出;对于转子在恒速稳态运行下的振动控制,首先确认该转速远离非能控区,然后将预设振幅取为高于正常运行振幅的值,尽管这样在初始状态不满足条件4,但有利于转子稳态振动的实时控制。
对于满足条件1~3的转子系统,当主动式DFD正压力增量不为0时,存在一个有界的伪偏导数,使得目标位置处转子的振幅增量可以通过以下紧格式动态线性化模型表示9
式中  为目标位置处转子振幅的增量。
式(8)建立了输出变化与正压力输入变化之间的关系,可以基于该式设计正压力的控制策略,以使得目标位置处转子的振幅稳定在预设振幅,定义损失函数为:
式中  为正压力增量的惩罚系数,用于产生平滑的正压力输出。
通过最小化式(9)的损失函数,能够得到k时刻主动式DFD的最优正压力,以使得目标位置处转子的振幅与预设振幅之间的差值最小,将式(8)代入式(9),对求导并令导数为0,可得:
式中  为步长因子。
由于式(10)表达的正压力控制策略中显含未知的PPD值,因此需要设计相应算法对其进行估计,构造的损失函数为:
式中  分别为kk-1时刻的PPD估计值;为大于0的惩罚系数。
将式(11)对求导并令导数为0,得到的估计算法为:
式中  为步长因子。
式(10)及(12)分别构成了正压力的输出算法及PPD值的估计算法,为保证算法的稳定性,引入如下的PPD估计值重置算法及正压力饱和算法:
式中  为PPD估计初值;为第k个时间步期望的正压力输出;为第k个时间步实际的主动式DFD正压力输出;为预设的正压力最大值。
MFAC伪偏导数PPD的估计初值将很大程度上决定控制器的性能,然而在转子系统模型未知的情况下,难以预先确定合适的估计初值。VRFT16是一种通过一组离线I/O数据一次性完成控制器参数整定的优化算法,它通过最小化一给定的损失函数求得与参考模型控制性能最接近的控制器参数,不需要对控制器参数进行在线寻优,适合用于MFAC的PPD估计初值整定。
对式(10)应用Z变换,并取定,步长因子取为1,则控制器的开环脉冲传递函数表示为:
在惩罚系数取定的情况下,对PPD估计初值的整定就被转化为对控制器参数的估计。图5为应用VRFT进行参数整定的算法框图,其中分别为离线测试获得的k时刻的干摩擦阻尼器正压力及目标位置处转子的振幅;分别表示由实际测试信号按特定算法逆向构建而成的虚拟参考信号、虚拟误差及虚拟参考模型。
为通过估计控制器开启时振幅与正压力之间的准线性关系,可以通过线性增加的正压力输入来产生离线I/O数据,即正压力信号为:
式中  为进行离线数据生成时的最大正压力;为正压力达到最大值所需要的时间;为采样时间;k为采样时刻序号,
提取各个对应时刻的实际信号即可得到用于控制器参数寻优的离线数据。虚拟参考模型的引入是为了使得实际信号追踪虚拟参考信号,因此可将其设计为:
采用式(16)生成的虚拟参考信号领先于离线振幅信号单位采样间隔的时间,此时及虚拟误差可分别表示为:
VRFT通过最优化控制器参数,使得控制器在虚拟误差下能够使受控转子系统产生与虚拟参考模型输出一致的系统输出,即最小化损失函数为:
式(19)中显含被控转子系统脉冲传递函数,因此无法直接求解该最优问题。构造损失函数为:
为使式(19)和(20)取最小值时所对应的控制器参数一致,文献[17]建议采用下式所示形式的滤波器来对虚拟误差以及主动式DFD正压力进行修正:
经由滤波器修正后的虚拟误差以及主控式DFD摩擦副上的正压力分别可以表示为。将它们代入式(20)并将式(20)关于控制器参数求导,可得最优控制器参数的表达式为:
其中,
进一步,令,其中为人为取定的常数,能够得到MFAC伪偏导估计初值为:
基于以上算法以及2.1节中提出的振动控制策略,最终形成的基于VRFT⁃MFAC进行主动式DFD⁃转子系统振动控制的流程总结如下:
(1)结合目标位置处转子的响应随主控式DFD摩擦副上正压力的变化特点确定主动式DFD的各工作转速区间,并对各个区间设定合适的预设振幅;
(2)对各工作转速区间选定用于参数整定的运行转速,对过临界振动,参数整定转速选取为工作转速区间边界转速;对稳态振动,参数整定转速选择为运行转速。在这些转速下进行离线加载测试,生成n组I/O信号,然后基于VRFT过程得到各工作转速区间中MFAC的PPD初值
(3)实际运行时,通过转速传感器获取转子实时转速,当处于第i个工作转速区间时,应用相应的PPD初值开启控制器,否则控制器保持关闭状态。
相应振动控制流程框图如图6所示。
为验证上述主动式DFD转子系统振动控制策略的有效性,下面将基于Simulink对一双盘转子系统进行数值仿真。转子系统一共被划分为7个轴段,各轴段采用Timoshenko梁单元建模,盘以等效质量以及转动惯量的形式集总到对应节点处,最终形成的转子系统有限元模型如图7所示。
转子材料为45#钢,相应物性参数为:弹性模量为209 GPa,泊松比为0.269,密度为7850 kg/m3。转子系统两端安装有弹性环支承,材料为65Mn弹簧钢;在左端弹支处安装有主动式DFD,摩擦副材料为铁基粉末冶金材料。各项结构参数的设计值如表1所示。不平衡量分别加在盘1以及盘2处,振幅均为5 g·cm。
转子系统的第一阶临界转速为2944 r/min。控制目标是通过所提出的控制策略改变位于节点4处的主动式DFD摩擦副上的正压力,使得转子上盘1处在过临界转速或稳态运行状态下的振动维持在给定水平以下。采用4阶Runge⁃Kutta法对式(5)进行数值求解,为了保证DFD摩擦力的计算精度,时间步长取为10-4 s。
由于转子系统振动非能控区的存在,需要合理选择离线数据生成参数来获得准确的PPD估计初值。针对式(15)中提出的离线I/O数据生成过程,本节主要讨论生成参数,包括DFD摩擦副上最大正压力、生成时间对PPD估计初值的影响,以及离线数据生成参数的选取规则。
选取分别为1~100 N区间均布的20个工况,得到PPD估计初值随变化如图8(a)所示。图8(b)进一步给出了a,b,c三个状态点(最大正压力分别为11,61,71 N)所对应转子系统的时域响应。当最大正压力过大时,对应状态点c,摩擦副将出现黏滞现象,此时PPD估计初值出现明显偏差;若取值较大,如状态点b,此时转子系统响应与正压力变化的线性关系较差,PPD估计值存在偏差;若取值较小,如状态点a,正压力与转子系统响应间的线性化关系更好,PPD估计初值基本稳定。因此,为防止非能控区对PPD初值估计造成影响,同时使PPD估计初值能反映初始时刻正压力与振幅变化之间的准线性关系,在生成离线I/O信号时,应通过选取较小的最大正压力来获得可接受的PPD估计值。
另一方面,图9给出了选取不同生成时间时得到的PPD估计初值以及各状态点的转子时域响应。当较小(状态点a~c)时,摩擦副上的正压力变化较快,此时转子系统的响应更多由瞬态特性主导;当较大(状态点d~e)时,主动式DFD正压力变化较缓慢,转子系统的响应与正压力线性关系较好,PPD估计初值基本稳定。因此,选取较大的生成时间,整定得到的PPD估计初值更能反映转子系统的振幅与主动式DFD正压力变化之间的准线性关系。
该转子系统的第一阶平动临界转速为2944 r/min,为确定工作转速区,加速度取为1 Hz/s,图10给出了DFD摩擦副始终分离以及始终黏滞时盘1处转子的加速不平衡响应曲线。在第一阶临界转速附近,转子振幅将随主动式DFD摩擦副上的正压力的增大而逐渐减小,直至DFD摩擦副处于黏滞状态,满足条件5,因此能够在第一阶临界转速附近设计主动式DFD摩擦副上的正压力控制算法。
取转子系统过临界转速区的工作转速区间为2760~3200 r/min,并取能控区内的预设振幅为0.1 mm。对于加速过程,在边界转速2760 r/min处进行参数整定,最终整定得到的PPD估计初值为-0.0242 mm/N。
为说明VRFT⁃MFAC的优点,图11中进一步对比了本文方法与未经参数整定的MFAC、文献[11]中的连续增益调度PI控制对转子加速过临界转速区的振动控制效果。结果表明,本文提出的控制方法能够有效控制转子的过临界转速振动,振动控制效果与文献[11]中方法的控制效果相当,且均优于不进行参数整定的MFAC。然而文献[11]的方法需要多次参数在线寻优,本文方法仅需进行一次参数离线整定,因而具有更高的效率。
图12为在转子稳态运行转速为5700 r/min时,转子盘1的振幅随DFD摩擦副上正压力的变化情况。随着DFD摩擦副上正压力的增大,转子振幅逐渐减小至界面处于黏滞状态而保持不变,该转速不位于非能控区内,满足条件5,因而能够设计DFD正压力控制算法抑制转子振动。
在未应用DFD时盘1位置转子的振幅为0.043 mm,为说明2.1节提出的预设振幅高于转子稳态运行振幅的优点,取预设振幅为0.08 mm,进一步将本文方法与不进行振动控制、采用被动控制的转子稳态响应以及阻尼器正压力的变化进行对比,结果如图13所示。在0.5 s开启控制器时,由于盘1处转子的振动仅为0.043 mm,预设振幅高于能控区的上边界,不满足条件4,但此时式(13)引入的重置算法保证了条件5,PPD值恒为负,结合式(10)可知输出正压力将保持为0,转子振动状态维持不变;而对于被动式DFD,由于正压力不可调,阻尼器即便在转子自由振幅较小的运行状态下仍处于工作状态,这将导致不必要的运行磨损。
而当2.5 s在盘1处添加12 g·cm的突加不平衡时,转子振幅将迅速升高,主动式DFD将自适应地输出摩擦力使转子振幅维持在预设振幅。因此,这种控制策略能够自动实现在振动过大时进行摩擦力输出,进而最小化对原转子稳态运动的影响。
较大的预设振幅也有利于防止DFD进入黏滞状态,图14进一步给出了预设振幅取为0.08,0.03 mm时(以下简称工况1与工况2)盘1响应以及正压力的变化曲线。0.5 s控制器开启后,工况2的盘1振幅降低至0.03 mm,与工况1采用的控制策略相比仅相差0.01 mm左右;然而当2.5 s突加不平衡发生时,工况2中过低的预设振幅将导致正压力输出迅速增大至饱和值500 N,使得干摩擦界面过早进入黏滞状态,响应稳定时间较工况1明显增加;同时,黏滞状态导致转子轴心轨迹出现偏移,工况2部分时刻的转子位移反而高于工况1,对转子的振动控制不利。
为通过主动式干摩擦阻尼器进行转子振动控制,本文结合转子响应随干摩擦阻尼器摩擦副上正压力的变化特点,基于虚拟参考反馈整定技术设计了正压力的无模型自适应控制策略。仿真结果表明,所提出的控制策略仅需进行一次离线参数整定就能够有效将转子系统过临界转速区的振动维持在给定水平;对于稳态振动控制,该控制策略能够自适应地仅在转子振动过大时输出正压力,从而将转子的振动控制在安全范围内,并最小化对正常运行状态下转子系统动力学特性的影响,具有较高的工程应用价值。
  • 国家科技重大专项资助项目(J2019-Ⅳ-0005-0073)
  • 国家自然科学基金资助项目(12372059)
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2024年第37卷第12期
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doi: 10.16385/j.cnki.issn.1004-4523.2024.12.013
  • 接收时间:2022-11-20
  • 首发时间:2026-02-12
  • 出版时间:2024-12-28
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  • 收稿日期:2022-11-20
  • 修回日期:2023-03-02
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国家科技重大专项资助项目(J2019-Ⅳ-0005-0073)
国家自然科学基金资助项目(12372059)
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    浙江大学电气工程学院,浙江 杭州 310027

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祝长生(1963―),男,博士,教授。E-mail:
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2种不同金属材料的力学参数

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鹅膏菌科Amanitaceae 2 11 5.26 鹅膏菌属 Amanita 10 4.78
小菇科 Mycenaceae 2 12 5.74 丝盖伞属 Inocybe 5 2.39
多孔菌科 Polyporaceae 8 14 6.70 蜡蘑属 Laccaria 5 2.39
红菇科 Russulaceae 3 23 11.00 小皮伞属 Marasmius 6 2.87
小菇属 Mycena 11 5.26
光柄菇属 Pluteus 5 2.39
红菇属 Russula 17 8.13
栓菌属 Trametes 5 2.39
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